Children can spend hours a day looking at computer screens and other digital devices . Some eye doctors say this leads to an increase in "computer vision syndrome ." Nathan Bonilla-Warford is an optometrist in Tampa, Florida. He has seen an increase in problems in children. "A lot more children come into the office either because their parents have noticed that they have headaches or red or watery eyes or discomfort, or because their nearsightedness appears to be increasing and they're worried," he says. Dr. Bonilla-Warford says part of the problem is that children may be more likely to pay no attention to early warning signs than adults. "Even if their eyes start to feel uncomfortable or they start to get a headache, they're less likely to tell their parents, because they don't want to have the game or the computer or whatever taken away," he explains. He says another part of the problem is that people blink less often when they use digital devices. He says, "A person who uses an electronic device blinks about one third as much as we normally do in everyday life. And so that can result in the front part of the eye drying and not staying protected like normal." Eye doctors offer suggestions like following which is known as the 20/20/20 rule. That means every twenty minutes look away twenty feet or more for at least twenty seconds from whatever device you're using. Other suggestions include putting more distance between you and the device and using good lighting. Of course, another way is to spend less time looking at screens. Many experts say children should spend no more than two hours a day using digital devices--with no screen time for children under two. But not all eye doctors have noticed an increase in problems in children. Dr. David Hunter, from Children's Hospital Boston, has not seen an increase in his practice. "While it is possible to develop _ looking at screens for a long period of time, there's certainly no proof that it actually causes any damage to the eyes." he says. What are the answers to this following set of questions: 1. What are the symptoms of computer vision syndrome?
2. What causes it?
3. Who says this?
4. What is he?
5. Where?
6. Why do they get it?
7. How much less?
8. Why don't the kids say anything?
9. What happens when you don't blink?
10. What can you do?
11. What is that?
12. Who says that?
13. What else can you do?
14. What else?
15. Who thinks that?
16. Does everyone agree?
17. Who?
18. Where is he?
19. Why does he believe that?
20. Of what?
Answer: 1. headaches or red or watery eyes or discomfort
2. computer screens and other digital devices
3. Nathan Bonilla-Warford
4. optometrist
5. Tampa, Florida
6. people blink less often when they use digital device
7. one third as much
8. they don't want to have the game or the computer or whatever taken away
9. front part of the eye drying and not staying protected like normal
10. the 20/20/20 rule
11. every twenty minutes look away twenty feet or more for at least twenty seconds from whatever device you're using
12. Dr. Bonilla-Warford
13. putting more distance between you and the device and using good lighting
14. spend no more than two hours a day using digital devices--with no screen time for children under two
15. Dr. Bonilla-Warford
16. no
17. Dr. David Hunter
18. Boston
19. there's certainly no proof
20. that it actually causes any damage to the eyes.

An oak is a tree or shrub in the genus Quercus (; Latin "oak tree") of the beech family, Fagaceae. There are approximately 600 extant species of oaks. The common name "oak" also appears in the names of species in related genera, notably "Lithocarpus" (stone oaks), as well as in those of unrelated species such as "Grevillea robusta" (silky oaks) and the Casuarinaceae (she-oaks). The genus "Quercus" is native to the Northern Hemisphere, and includes deciduous and evergreen species extending from cool temperate to tropical latitudes in the Americas, Asia, Europe, and North Africa. North America contains the largest number of oak species, with approximately 90 occurring in the United States, while Mexico has 160 species of which 109 are endemic. The second greatest center of oak diversity is China, which contains approximately 100 species. 

Oaks have spirally arranged leaves, with lobate margins in many species; some have serrated leaves or entire leaf with smooth margins. Also, the acorns contain tannic acid, as do the leaves, which helps to guard from fungi and insects. Many deciduous species are marcescent, not dropping dead leaves until spring. In spring, a single oak tree produces both male flowers (in the form of catkins) and small female flowers. The fruit is a nut called an acorn or oak nut borne in a cup-like structure known as a cupule; each acorn contains one seed (rarely two or three) and takes 6–18 months to mature, depending on their species. The live oaks are distinguished for being evergreen, but are not actually a distinct group and instead are dispersed across the genus. What are the answers to this following set of questions: 1. What family is the oak in?
2. How many species are there?
3. How are their leaves arranged?
4. What is their "fruit"?
5. Called what
6. How many seeds are usually in an acorn?
7. Can there be more than one?
8. What chemical is in an acorn?
9. How does that help the tree?
10. Are all oaks deciduous?
11. Which species isn't?
12. Are they a distinct group?
13. Are there oaks in Australia?
14. How many types of oaks are in the US?
15. And in Mexico?
Answer: 1. beech family
2. 600
3. spirally arranged
4. a nut
5. acorn
6. One
7. Yes
8. tannic acid
9. helps to guard from fungi and insects
10. No
11. evergreen species
12. No
13. unknown
14. approximately 90
15. 160

Biodiversity, a contraction of "biological diversity," generally refers to the variety and variability of life on Earth. One of the most widely used definitions defines it in terms of the variability within species, between species, and between ecosystems. It is a measure of the variety of organisms present in different ecosystems. This can refer to genetic variation, ecosystem variation, or species variation (number of species) within an area, biome, or planet. Terrestrial biodiversity tends to be greater near the equator, which seems to be the result of the warm climate and high primary productivity. Biodiversity is not distributed evenly on Earth. It is richest in the tropics. Marine biodiversity tends to be highest along coasts in the Western Pacific, where sea surface temperature is highest and in the mid-latitudinal band in all oceans. There are latitudinal gradients in species diversity. Biodiversity generally tends to cluster in hotspots, and has been increasing through time, but will be likely to slow in the future. What are the answers to this following set of questions: 1. What tends to cluster in hotspots?
2. Will it speed up or slow down in the future?
3. What's it a contraction of?
4. Does it talk about life on Mars?
5. What type of life does it refer to?
6. Does it encompass a variety of life?
7. Are ecosystems important parts of biodiversity?
8. What about species?
9. What type of gradients are there in species diversity?
10. Which band in all oceans is it highest?
11. Are the sea surface temperatures there higher or lower than other places?
12. Which coasts?
13. What type of biodiversity on those coasts?
14. Is biodiversity distributed evenly on Earth?
15. Is it found more or less in the tropics?
16. What type of biodiversity is greater near the equator?
17. What is that a result of?
18. Is genetic variation part of biodiversity?
19. What other types of variation are as well?
20. Does species variation extend to the whole planet?
Answer:
1. Biodiversity
2. slow
3. biological diversity
4. no
5. life on Earth
6. yes
7. yes
8. yes
9. latitudinal gradients
10. mid-latitudinal
11. higher
12. Western Pacific
13. Marine
14. no
15. more
16. Terrestrial
17. warm climate and high primary productivity
18. yes
19. ecosystem and species
20. yes